[ambiance radiance] iconsistent use of light / shadows in scrollbar

Binary package hint: light-themes

Using Lucid beta-1 with the light-themes I have the following issues:

The use of light (gradients + shadows) is inconsistent in the theme. Generally the light seems to come from above - but certain elements indicate the light comes only from the left side or that light is reflected.

While this seems to be a minor issue at first sight it is a major design flaw. To illustrate this just put two icons/graphical elements together, where for one object the light seems to come from above and for the other object the light seems to come from the bottom. Everybody will immediately see that the lighting of the elements do not fit together.
To conclude: for a consistent appearance the consistent use of light/shadows is absolutely crucial.

The problem is best illustrated with the attached screen-shot.
Almost all elements are designed with light from above (virtual light source above the screen). This can be seen at all places that are indicated by 1 in the screenshot. (The Window boarders, icons and so on). These elements generally have a gradient that is lighter on the top and darker on their bottom which gives the illusion of a 3-dimensional round shape with a light-source above the desktop. Same for the Icons - they often have the light from above, and consequently the shadow just below the icon.

Now we have at least two elements with a inconsistent source of light (use of shadow and gradients). These elements therefore do not fit naturally to the rest of the desktop. (Wrong shadows / light are often not perceived conscientiously by most of the people - however many people can say that something seems to be wrong with it)

At the place marked by "2" in the screen-shot (the scrollbar): Here the light seems NOT to shine from above but exclusively from the left of the desktop. Actually since the gradient is very strong it gives the impression of a very deep half-tube in which the slider is embedded. However if it would be a deep half-tube we should actually see shadows from above at the top of this half-tube (where the tube ends). In addition with a light source from above there shouldn't be any shadows (gradients) at the left of the half-tube, in the lower part of the half tube (= in the background of the scroll-bar).
I think this is the main reason why the scroll bar seems not to fit in the whole picture.

One solution would be to give the scrollbar a flat design. (Only a apply a very smooth gradient and make the total colour a bit darker to maintain the contrast).

Another example:
At the place marked by "3" in the screen-shot (the close button):
Here the light seems to come from above on a round button (The fact that the button has the shape of a half dome is a different issue). However if we take a detailed look a the lighting we perceive something odd: There seems to be a different source of (weak) light from bellow. As a result we have a second source of light at the place where there should be a shadow.
Of course this could be some source of reflection. (Light reflected by elements bellow) However the use of reflected light is completely inconsistent with the rest of the design.

One solution would be to apply a flat bottom design - as in the rest of the desktop (compare with the buttons in the panel or the min/max buttoms). At the minimum one should apply the same light - shadow design for all elements on the desktop.

Please let me know if you need further explications.